---
layout: example
category: example
title: Select features around a clicked point
description: 'Click on the map to query features using <code>queryRenderedFeatures</code>.'
tags:
  - user-interaction
---
<div id='map'></div>

<script>
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/streets-v9',
    center: [-98, 38.88],
    minZoom: 2,
    zoom: 3
});

map.on('load', function() {
    // Add the source to query. In this example we're using
    // county polygons uploaded as vector tiles
    map.addSource('counties', {
        "type": "vector",
        "url": "mapbox://mapbox.82pkq93d"
    });

    map.addLayer({
        "id": "counties",
        "type": "fill",
        "source": "counties",
        "source-layer": "original",
        "paint": {
            "fill-outline-color": "rgba(0,0,0,0.1)",
            "fill-color": "rgba(0,0,0,0.1)"
        }
    }, 'place-city-sm'); // Place polygon under these labels.

    map.addLayer({
        "id": "counties-highlighted",
        "type": "fill",
        "source": "counties",
        "source-layer": "original",
        "paint": {
            "fill-outline-color": "#484896",
            "fill-color": "#6e599f",
            "fill-opacity": 0.75
        },
        "filter": ["in", "FIPS", ""]
    }, 'place-city-sm'); // Place polygon under these labels.

    map.on('click', function(e) {
        // set bbox as 5px reactangle area around clicked point
        var bbox = [[e.point.x - 5, e.point.y - 5], [e.point.x + 5, e.point.y + 5]];
        var features = map.queryRenderedFeatures(bbox, { layers: ['counties'] });

        // Run through the selected features and set a filter
        // to match features with unique FIPS codes to activate
        // the `counties-highlighted` layer.
        var filter = features.reduce(function(memo, feature) {
            memo.push(feature.properties.FIPS);
            return memo;
        }, ['in', 'FIPS']);

        map.setFilter("counties-highlighted", filter);
    });
});
</script>
